Ceratolithaceae biostratigraphy of ODP Site 1237, equatorial Pacific

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Title: Ceratolithaceae biostratigraphy of ODP Site 1237, equatorial Pacific
Authors: Lancis Sáez, Carlos | Tent-Manclus, Jose Enrique | Flores, José Abel
Research Group/s: Evolución Geodinámica de la Cordillera Bética Oriental y de la Plataforma Marina de Alicante
Center, Department or Service: Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente
Keywords: Ceratolithaceae | Biostratigraphy | ODP Site 1237 | Equatorial Pacific
Issue Date: Aug-2024
Publisher: INA (International Nannoplankton Association)
Citation: Journal of Nannoplankton Research. 2024, 42-special, INA 19 abstracts: 72
Abstract: Site 1237 was drilled during Ocean Drilling Program (ODP) Leg 202 in the equatorial Pacific at a water depth of 3212 m on the easternmost flank of the Nazca Ridge, approximately 140 km off the coast of Peru. Four boreholes were drilled: Holes 1237A, 1237B, 1237C, and 1237D. Forty-two smear slides were studied from Hole 1237B between 179.67 meters composite depth below seafloor (mcd) and 113.53 mcd. To determine the fine details of the nannofossil structures, 63 samples from Holes 1237B, 1237C, and 1237D were prepared for scanning electron microscopy (SEM) using a technique of centrifugation/filtration. The focus of our work is from the lowest occurrence of Amaurolithus primus at 149.86 mcd in sample 1237B-15H-6, 75 cm, which evolved from Orthorhabdus rugosus, to the highest occurrence of Amaurolithus delicatus at 54.49 mcd (sample 1237B-6H-4, 75 cm). Amaurolithus delicatus, which evolved from A. primus, first appears at 143.81 mcd, followed by Nicklithus amplificus, which also evolved from O. rugosus and first occurs at about 135.22 mcd. At 124.84 mcd, A. primus is no longer present, and at 115.04 mcd, N. amplificus is also absent. In the latest Messinian, a new ceratolith branch evolved from O. rugosus. The first species to evolve is Ceratolithus finifer, which we found at 94.01 mcd. This sample also contains A. delicatus, the only species left from the previous ceratolith branch. After the appearance of C. finifer, the following species rapidly appear: C. acutus (90.67 mcd), C. armatus (87.71 mcd), C.? tricorniculatus (86.45 mcd), C. larrymayeri (86.34 mcd), C.? atlanticus (84.96 mcd), and C. cristatus (83.54 mcd). The highest occurrences of C. armatus (81.12 mcd), C. acutus (80.01 mcd), and C. larrymayeri and C.? tricorniculatus (both at 77.30 mcd) are found in close succession, whereas A. delicatus is present to 54.49 mcd. Ceratolithus cristatus is the only ceratolith present above 54.49 mcd. Ceratolithus? atlanticus is scarce in studied samples.
URI: http://hdl.handle.net/10045/148180
ISSN: 1210-8049
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2024 International Nannoplankton Association
Peer Review: si
Publisher version: https://ina.tmsoc.org/JNR/JNRcontents.htm
Appears in Collections:INV - GEODIN - Artículos de Revistas

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